2020/06-present: DevTech support game engines, benchmarks, tools; implement microbenchmarks, variable rate shading (fragment shading rate); for Samsung (AMD derived) XClipse GPU

2020/01-2020/05: Google ANGLE for Android (AOSP)

2019/06-2019/12: AMD training, GAPID, PreSil, AMDVLK, fmtlib (intern), VR, performance

2018/05-2019/06: gpu tools team; gpu trace editor lead (driver trace) (API)

2017/04-2018/05: gpu functional simulation (modeling); 3d support

Implement AMD GPU functional behavior in C++ especially shaders + 3d graphics pipeline (rendering). For pre-silicon GPU software development (drivers, diagnostics, vbios, firmware, performance, hybrid simulation).

Read AMD GPU hardware doc and DirectX OpenGL doc. Implement GPU logging for debug. Write directed tests to debug & verify DirectX OpenGL OpenCL API to exercise AMD driver + GPU model.

GPU specialist on full platform simulation ( http://developer.amd.com/simnow ). Simulates full platforms of hardware devices. C++ Linux Windows. Guest Linux Windows Android etc.

Implement application (tools) code & GUI such as Qt, device API, scripting support, tools. Full GPU stack debug and triage, full system debug (triage), automation regressions tools with Python, documentation.

Work with GPU full stack including GPU modeling, drivers, API (DirectX OpenGL Vulkan). Implement DirectX OpenGL to verify and debug GPU rendering support.

Outside of AMD, continued learning and hobby projects in 3d graphics, game programming, C++, GUI, various Computer Science & Software Engineering. Such as OpenGL demos, Unreal Engine 4, C# GUI.

Some exposure to non-GPU platform modeling (computer engineering). AMD training for Opteron architecture & PCI system architecture. SATA modeling. Work with teammates (eg triage bugs) on non-GPU device models (x86, ARM, chipsets) & simulation platform configurations. Specialized in GPU model + GPU software (full stack).

Qt GUI and simnow automation commands (simple scripting language). Device grouping (composite design pattern).

Automation and regressions (Python), nightly and precheckin automation, Linux farm LSF and Windows lab machine farm for development/testing. Continued to support, maintain, enhance in later years.

ATI Research (before AMD merger) (Marlborough, MA) (DirectX Drivers & Shader Compiler teams): Write DirectX 10 functional tests (to exercise driver). Integrate DirectX 10 Ref Rast shader (VS/GS/PS) interpreter (alpha release), compare results (HLSL or DX10 Asm) vs. (IL tokens) vs. (machine-specific binary) at each test run “cycle”, debug interpreter. Integrate SoftIL interpreter. Integrate DX10 tests. Document. Night/weekends: X-Box 360 GPU chip & console testing (vary clocks, temperatures, chip types to find pass/failure results).

DirectX 9.0 Vertex Shader performance benchmark (“ScullyMark”): C++ DX-9 VS (Assembly & HLSL) performance benchmark program, scripts and modules DX VS app-level dll plug-ins, VS Asm/HLSL text files, options (meshes, vert batch size, num frames, etc). Automate DX tests; results analysis; VS Asm benchmark tests, (C#, windows console scripts, Excel scripts, C++, DX VS Asm).

Developed a graphical scripting language (using C#, GDI graphics) GUI tool for automation. And a system to control lab hardware to automate testing of different hardware platforms. Used by BIOS and QA teams to write automated tests. Such as compile BIOS source code, automate flashing of the BIOS ROM, post BIOS, boot OS. Sort of like a simplified version of Unreal Engine's Blueprints specialized to automate BIOS QA.